We talk a lot about principles of movements in taijiquan.  It's a way of moving - not simply techniques and applications.  The more you read, the more you'll find different teachers emphasize different principles.   Although there are usually common threads, many teachers will disagree on order of importance as well as if something is actually a principle. 

Here is a link to Yang Cheng Fu's 10 principles along with explanations of what each one means. (http://taichivancouver.com/yang-cheng-fus-ten-principles-on-tai-chi-chuan/) What do you see in your own form?  Do you focus on any of these? 

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